Allow system apps to add to settings dashboard

Allow system apps to add a tile to the top level of settings that
links to an activity through adding a filter for a specific action.
Determine the info for the tile based off manifest info for the
activity. Also allow the same for managed profiles, but show a dialog
in between to select which profile.

The category in which the item is to be placed must be in meta-data.
The icon and title can be specified through meta-data as well or
if unspecified the activity's label and icon will be used.

Also added an optional <external-tiles> tag to the dashboard
category xml, this allows Settings to put external tiles
in the middle of some categories (Personal does this).

Bug: 19443117
Change-Id: Idc9938d1549d181103a3030a8784b527215a8399

src/com/android/settings/UserAdapter.java

@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings;
+
+import android.app.ActivityManager;
+import android.content.Context;
+import android.content.pm.UserInfo;
+import android.database.DataSetObserver;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.ListAdapter;
+import android.widget.SpinnerAdapter;
+import android.widget.TextView;
+
+import com.android.internal.util.UserIcons;
+import com.android.settings.drawable.CircleFramedDrawable;
+
+import java.util.ArrayList;
+
+/**
+ * Adapter for a spinner that shows a list of users.
+ */
+public class UserAdapter implements SpinnerAdapter, ListAdapter {
+    // TODO: Update UI. See: http://b/16518801
+    /** Holder for user details */
+    public static class UserDetails {
+        private final UserHandle mUserHandle;
+        private final String mName;
+        private final Drawable mIcon;
+
+        public UserDetails(UserHandle userHandle, UserManager um, Context context) {
+            mUserHandle = userHandle;
+            UserInfo userInfo = um.getUserInfo(mUserHandle.getIdentifier());
+            Drawable icon;
+            if (userInfo.isManagedProfile()) {
+                mName = context.getString(R.string.managed_user_title);
+                icon = context.getDrawable(
+                    com.android.internal.R.drawable.ic_corp_icon);
+            } else {
+                mName = userInfo.name;
+                final int userId = userInfo.id;
+                if (um.getUserIcon(userId) != null) {
+                    icon = new BitmapDrawable(context.getResources(), um.getUserIcon(userId));
+                } else {
+                    icon = UserIcons.getDefaultUserIcon(userId, /* light= */ false);
+                }
+            }
+            this.mIcon = encircle(context, icon);
+        }
+
+        private static Drawable encircle(Context context, Drawable icon) {
+            return CircleFramedDrawable.getInstance(context, UserIcons.convertToBitmap(icon));
+        }
+    }
+    private ArrayList<UserDetails> data;
+    private final LayoutInflater mInflater;
+
+    public UserAdapter(Context context, ArrayList<UserDetails> users) {
+        if (users == null) {
+            throw new IllegalArgumentException("A list of user details must be provided");
+        }
+        this.data = users;
+        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+    }
+
+    public UserHandle getUserHandle(int position) {
+        if (position < 0 || position >= data.size()) {
+            return null;
+        }
+        return data.get(position).mUserHandle;
+    }
+
+    @Override
+    public View getDropDownView(int position, View convertView, ViewGroup parent) {
+        final View row = convertView != null ? convertView : createUser(parent);
+
+        UserDetails user = data.get(position);
+        ((ImageView) row.findViewById(android.R.id.icon)).setImageDrawable(user.mIcon);
+        ((TextView) row.findViewById(android.R.id.title)).setText(getTitle(user));
+        return row;
+    }
+
+    private int getTitle(UserDetails user) {
+        int userHandle = user.mUserHandle.getIdentifier();
+        if (userHandle == UserHandle.USER_CURRENT
+                || userHandle == ActivityManager.getCurrentUser()) {
+            return R.string.category_personal;
+        } else {
+            return R.string.category_work;
+        }
+    }
+
+    private View createUser(ViewGroup parent) {
+        return mInflater.inflate(R.layout.user_preference, parent, false);
+    }
+
+    @Override
+    public void registerDataSetObserver(DataSetObserver observer) {
+        // We don't support observers
+    }
+
+    @Override
+    public void unregisterDataSetObserver(DataSetObserver observer) {
+        // We don't support observers
+    }
+
+    @Override
+    public int getCount() {
+        return data.size();
+    }
+
+    @Override
+    public UserDetails getItem(int position) {
+        return data.get(position);
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return data.get(position).mUserHandle.getIdentifier();
+    }
+
+    @Override
+    public boolean hasStableIds() {
+        return false;
+    }
+
+    @Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        return getDropDownView(position, convertView, parent);
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return 0;
+    }
+
+    @Override
+    public int getViewTypeCount() {
+        return 1;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return data.isEmpty();
+    }
+
+    @Override
+    public boolean areAllItemsEnabled() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled(int position) {
+        return true;
+    }
+}